2026 Britannia Mint Error | Struck on Cupro-Nickel £5 Planchet Instead of Silver | NGC MS68
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This is a genuine, Royal Mint-confirmed minting error: a 2026 1oz Britannia struck using blanks intended for base-metal £5 crown coins, rather than the correct .999 fine silver rounds. The mix-up went undetected during production, and a small number of these off-metal strikes were distributed to a Royal Mint supplier before the error came to light. It is understood that only 209 of these coins exist.
Visually, the coin is identical on both sides to a standard 2026 1oz Silver Britannia — the same reverse design and the same uncrowned obverse portrait of King Charles III by Martin Jennings — but struck on a cupro-nickel planchet rather than silver. Cupro-nickel is the copper-and-nickel alloy The Royal Mint typically reserves for its base-metal commemorative crown releases, and the coin carries no silver or precious metal content whatsoever. Its value lies entirely in its rarity and documented origin as a genuine mint error, not in metal content.
The cupro-nickel composition on this example has been independently confirmed using in-house XRF (X-ray fluorescence) technology, adding a further layer of verification beyond the coin's NGC certification.
Graded NGC MS68 and encapsulated with the "Mint Error" designation on the label. NGC's highest confirmed grade for this error type to date is MS69, making this an exceptional example just one point below the current ceiling for the entire error population.
Coin Highlights
- Genuine Royal Mint-confirmed minting error, struck on a base-metal £5 cupro-nickel planchet instead of .999 silver
- Only 209 examples understood to exist
- Identical design to the standard 2026 1oz Silver Britannia on both sides
- Composition independently verified by XRF technology
- Obverse: uncrowned portrait of King Charles III by Martin Jennings
- Graded NGC MS68 with the official "Mint Error" label designation
- NGC's highest recorded grade for this error is MS69 — this example sits just below the current ceiling
- Encapsulated in a tamper-evident NGC holder for authenticity and protection
Specifications
| Year | 2026 |
| Mint | The Royal Mint, Llantrisant |
| Composition | Cupro-nickel (error — should be .999 fine silver) |
| Diameter | 38.61 mm |
| Obverse Designer | Martin Jennings (King Charles III, uncrowned portrait) |
| Reverse | Standard 2026 Britannia design |
| Known Population of This Error | Approximately 209 |
| Grading | NGC MS68, Mint Error designation |
| Highest Known Grade for This Error | MS69 |
Why This Coin Stands Out
Genuine, verified mint errors from The Royal Mint are rare events — this is a documented case with corroboration across multiple sources, an official Mint acknowledgement, and independent XRF metal verification, which is considerably more assurance than most error coins ever receive. With only 209 known examples and a grading ceiling of MS69, this NGC MS68 example represents a near-top-tier grade within an already tiny population. A genuinely unusual and highly collectable piece for anyone interested in modern British minting errors.
As UK legal tender, this coin is exempt from Capital Gains Tax for UK residents regardless of its composition. Browse our full range of graded gold Sovereigns to explore more rare and unusual certified coins.
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For non-bullion items (such as proof coins, graded coins or accessories), we’re happy to accept returns within 14 days of receipt if you feel your coin is not as described and provided the item is returned in its original condition, please contact us and we’ll be glad to help.
If an item is returned for reasons other than being not as described, return postage will be the responsibility of the buyer.
Important Notes
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Yes. Every NGC-certified coin has a unique certification number visible on the slab label. You can verify the grade, coin details and population data at NGCcoin.uk using the cert number shown.
The NGC census records how many examples of each coin have been graded at each level. A Top Pop coin means no other example has achieved a higher grade — making it the finest certified specimen in existence for that issue.
Yes. If you have existing graded sovereigns you'd like to trade towards a purchase, contact us for a bespoke cost-to-change valuation.